Arquillian is a powerful testing framework in the Java ecosystem that allows you to write integration tests for your applications. In this blog post, we will explore how to write Arquillian tests specifically for JAX-RS, the Java API for RESTful Web Services.

Setting up Arquillian

Before we dive into writing tests, we need to set up Arquillian in our project. Here’s how you can do it:

1. Add the Arquillian dependencies to your project’s build file. You can do this by adding the following dependencies to your pom.xml if you are using Maven:

<dependency>
    <groupId>org.jboss.arquillian.junit</groupId>
    <artifactId>arquillian-junit-container</artifactId>
    <version>1.4.0.Final</version>
    <scope>test</scope>
</dependency>

<dependency>
    <groupId>org.jboss.arquillian.container</groupId>
    <artifactId>arquillian-weld-ee-embedded-1.1</artifactId>
    <version>1.0.0.Final</version>
    <scope>test</scope>
</dependency>

1. Configure the Arquillian test container in your arquillian.xml file. This file should be placed in the src/test/resources directory and should contain the following:

<arquillian xmlns="http://jboss.org/schema/arquillian"
            xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
            xsi:schemaLocation="http://jboss.org/schema/arquillian http://jboss.org/schema/arquillian/arquillian_1_0.xsd">

    <defaultProtocol type="Servlet 3.0" />

    <container qualifier="jboss" default="true">
        <configuration>
            <property name="jbossHome">/path/to/your/wildfly</property>
        </configuration>
    </container>

</arquillian>

Make sure to replace /path/to/your/wildfly with the actual path to your Wildfly installation.

Writing a JAX-RS Arquillian test

Now that we have Arquillian set up, let’s write a simple test for a JAX-RS resource. We’ll be using JUnit 4 for our test case.

import org.jboss.arquillian.container.test.api.Deployment;
import org.jboss.arquillian.junit.Arquillian;
import org.jboss.shrinkwrap.api.ShrinkWrap;
import org.jboss.shrinkwrap.api.spec.WebArchive;
import org.junit.Test;
import org.junit.runner.RunWith;

import javax.ws.rs.client.Client;
import javax.ws.rs.client.ClientBuilder;
import javax.ws.rs.core.MediaType;

import static org.junit.Assert.assertEquals;

@RunWith(Arquillian.class)
public class HelloResourceTest {

    @Deployment(testable = false)
    public static WebArchive createDeployment() {
        // Create a web archive with your application classes and dependencies
        return ShrinkWrap.create(WebArchive.class)
                .addClasses(HelloResource.class)
                .addAsWebInfResource("beans.xml", "classes/META-INF/beans.xml"); // Add a beans.xml for CDI support
    }

    @Test
    public void testHelloResource() {
        // Use JAX-RS client to send a request to your resource
        Client client = ClientBuilder.newClient();
        String response = client.target("http://localhost:8080/myapp/hello")
                .request(MediaType.TEXT_PLAIN)
                .get(String.class);

        // Verify the response
        assertEquals("Hello, Arquillian!", response);
    }
}

In the above code, we have defined a simple JAX-RS resource called HelloResource which returns a “Hello, Arquillian!” message. The createDeployment method is responsible for creating the deployment package for our test. We are using the JAX-RS Client to send a GET request to our resource and assert that the response matches our expectation.

Running the Arquillian test

To run the Arquillian test, you can simply run it as a JUnit test within your IDE or via your build tool.

Make sure that your Wildfly server is up and running before running the test.

That’s it! You have now successfully written an Arquillian test for your JAX-RS resource. Arquillian provides powerful capabilities for testing various parts of your application, and with JAX-RS, you can ensure that your RESTful web services are working as expected.

#testing #Arquillian